package com.zjuee.core.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.http.HttpServletResponse;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author wu liang
 * @since 1.0
 */
@Slf4j
public class ExportExcelDownFee {

    //map的数据名
    private String[] keys ;
    //导出表的列名
    private String[] rowName ;
    //导出表的标题
    private String title;
    //导出表的日期
//    private String dateHeaders;
    //sheet表表名
    private String sheetName;

    private Object obj = new ArrayList<Object>();

    HttpServletResponse response;

    //构造方法，传入要导出的数据
    public ExportExcelDownFee(ExportExcel sheets){
        this.keys = sheets.getKeys();
        this.obj = sheets.getDataList();
        this.title = sheets.getTitle();
//        this.dateHeaders = dateHeaders;
        this.rowName = sheets.getRowName();
        this.sheetName = sheets.getSheetName();
    }

    /*
     * 导出数据
     * */
    public void export(Workbook workbook) throws Exception{
        try{
            Sheet sheet = workbook.createSheet(sheetName);                  // 创建工作表

            CellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            CellStyle style = this.getStyle(workbook);                  //单元格样式对象

            // 定义所需列数
            int columnNum = rowName.length;

            //第一行
            Row rowfirstName = sheet.createRow(0);
            Cell oneCellRowName = rowfirstName.createCell(0);               //创建列头对应个数的单元格
            oneCellRowName.setCellType(CellType.STRING);             //设置列头单元格的数据类型
            HSSFRichTextString oneText = new HSSFRichTextString(title);
            oneCellRowName.setCellValue(oneText);                                 //设置列头单元格的值
            //合并单元格CellRangeAddress构造参数依次表示起始行，截至行，起始列， 截至列
            sheet.addMergedRegion(new CellRangeAddress(0,0,0,columnNum-1));
            oneCellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式

            //第二行
//            Row rowDateName = sheet.createRow(1);
//            Cell  DateCellRowName = rowDateName.createCell(3);
//            DateCellRowName.setCellValue(dateHeaders);
//            DateCellRowName.setCellStyle(columnTopStyle);


            Row rowRowName = sheet.createRow(1);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            // 将列头设置到sheet的单元格中
            for(int n=0;n < columnNum ;n++){
                rowRowName.setHeight((short) 400);
                Cell  cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
//                cellRowName.setCellType(CellType.STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(style);                       //设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            if(obj instanceof List){
                List<Object> dataList = (List<Object>) obj;
                for(int i=0;i<dataList.size();i++){
                    //设置每行每列的值
                    Object obj = dataList.get(i);//遍历每个对象
                    Row row = sheet.createRow(i+2);//创建所需的行数（从第二行开始写数据）
                    if (obj == null)
                        continue;
                    Map data;
                    if (obj instanceof Map){
                        data = (Map) obj;
                    }
                    else{
                        data = transBean2Map(obj);
                    }

                    for(int j=0; j<keys.length; j++){
                        Cell  cell = null;   //设置单元格的数据类型
                        if(j == 0){
                            cell = row.createCell(j,CellType.STRING);
                            cell.setCellValue(i+1);
                        }else{
                            cell = row.createCell(j,CellType.STRING);
                            if(!"".equals(data.get(keys[j].trim())) && data.get(keys[j].trim()) != null){
                                cell.setCellValue(data.get(keys[j].trim()).toString());   //设置单元格的值
                            }
                        }
                        cell.setCellStyle(style); //设置单元格样式
                    }
                }
            }


            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum <= sheet.getLastRowNum(); rowNum++) {
                    Row currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        Cell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == CellType.STRING  && StringUtils.isNotBlank(currentCell.getStringCellValue())) {
                            int length = 0;
                            try {
                                length = currentCell.getStringCellValue().getBytes().length;
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }

                }
                if(colNum == 0){
                    sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
                }else{
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                }
            }

        }catch(Exception e){
            e.printStackTrace();
        }
    }

    /*
     * 列头单元格样式
     */
    private CellStyle getColumnTopStyle(Workbook workbook) {

        // 设置字体
        Font font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short)11);
        //字体加粗
        //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("宋体");
        //设置样式;
        CellStyle style = workbook.createCellStyle();
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }

    /*
     * 列数据信息单元格样式
     */
    private CellStyle getStyle(Workbook workbook) {
        // 设置字体
        Font font = workbook.createFont();
        //设置字体名字
        font.setFontName("宋体");
        //设置样式;
        CellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }

    /**
     * Bean --> Map 1: 利用Introspector和PropertyDescriptor 将Bean --> Map
     */
    private static Map<String, Object> transBean2Map(Object obj) {
        if (obj == null) {
            return null;
        }
        Map<String, Object> map = new HashMap<>();
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                // 过滤class属性
                if (!key.equals("class")) {
                    // 得到property对应的getter方法
                    Method getter = property.getReadMethod();
                    Object value = getter.invoke(obj);
                    map.put(key, value);
                }

            }
        } catch (Exception e) {
            log.error("transBean2Map Error ", e);
        }
        return map;
    }
}
